Improvement in seat-hinges



M. W. G.HASE. Seat-Hinges. No. 141,115, Patentedjuly 22,1873.

WITNESSES: INVENTOR:

r/ I J I rl Mgflttomeys.

AM PHoro-LmmsBAH-uc an my. (osszmn's mamas) UNITED STATES PATENT QFFICE.

MARGELLUS W. CHASE, OF BUFFALO, NEW YORK.

IMPROVEMENT IN SEAT-HINGES.

Specification forming part of Letters Patent No. 141,115, dated July 22,1873; application filed June 30, 1873.

To all whom it may concern:

Be it known that I, MARCELLUS W. OHAsE, of Buffalo, in the county ofErie, New York, have invented an Improved Seat-Hinge, of which thefollowing is a specification:

This invention relates to hinges for attaching and supporting thefolding seats of schooldesks, opera-chairs, and settees; and it consistsin a peculiar construction of hinge adapted to securely support the seatin effective without impairing the efflciency of the flange as asupport.

Figure l is a perspective view of the seatarm and a contiguous portionof the standard of a school-desk illustrating this invention. Fig. 2 isa perspective view of the standard, showingv one member of the hinge.Fig. 3 is -a perspective view of the seat-arm, showing the other memberof the hinge. Fig. 4 is an elevation of the two parts, the seat-armbeing shown in dotted lines, illustrating the method of unshipping theseat. I

This invention is applicable to folding-seats in general, but isprimarily designed for application to school-desks and settees. Theimproved hinge is composed of two circular or segmental members, A B,and an axial bolt, (J. The members A B are preferably cast,respectively, on the standards D and seatarm E, as in the illustration.

The construction of the members A B, in which the invention consists, isas follows: Each part is constructed with a central aperture, z 2 toreceive the bolt (J, and the main surface y 3 of each member is flat andpar allel with that of the other. Projecting from this surface of thepartAis a stop-lug, m, with two faces, 12, and a supporting-flange,w,concentric with the aperture 2. On the surface 3 of the part B aconcentric segmental projection, '0, is formed so as to fit within theflange w. The two ends3 4 of this projection abut respectively on theends 1 2 of the stoplug as to arrest and support the seat in itshorizontal and vertical positions. In the former or efl'ective positionof the seat the pressure or strain is sustained by the rear end of theprojection '22 and the supporting-flange w, and the clamping-bolt isthus relieved from the same.

The supporting-flange w and the projection c are made suficiently thickand the stop-lug x sufficiently long to possess the requisite strength.The length of the projection 01 is determined by that of the stoplug andthe space through which it is to move between the positions of the seat.

The depth of the projections need only be sufficient to obviate slippingin case the bolt should be loosened. The hinge may be as smallindiameter as other hinges now in use in which inclosed stop-lugs areemployed.

To provide for unshipping the seat a space, u, is left behind thestop-lug w of sufficient size to permit the escape of the projection awhen the seat-arm is in vertical position, as illustrated in Fig. 4.

The bolt 0 may be of the form commonly employed, with countersunk headat one end and a screw-nut adapted to be turned by the ordinary wrenchat the other.

The following is claimed as new A seat-hinge comprising a central bolt,0, for clamping the parts together, and a flange, w, having a recess, a,a stop-lug, m, and a projection, o, concentric therewith, and formed andarranged on the standard and seat-arm, substantially as hereindescribed.

MABOELLUS W. CHASE.

Witnesses:

GEORGE D. EMERSON, WESLEY CHASE.

